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Measuring the Effects of Congestion and Request Location on Transit Signal Priority Matt Dorado Erin Qureshi River Hwang Portland State University
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Outline Introduction Objective Study Design Test Scenarios Results Conclusions/Future Research
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Introduction Transit Signal Priority Concept “Smart bus” knows location and schedule status Bus communicates priority request to signal Local controller provides priority
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Onboard System PCMIA CardControl Head
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Priority Call Sequence
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TSP Criteria Is the bus within Portland city limits? Is the bus on route? Are the bus doors closed? Has the request already been sent? Is the bus behind schedule ?
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Signal Timing Green Extension Standard Plan 46 seconds 25.5 seconds39 seconds 19 seconds 39.5 seconds 34.5 seconds32 seconds 27.5 seconds Green extension allows bus to get through the signal
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Signal Timing Red Truncation 39.5 seconds 34.5 seconds32 seconds 27.5 seconds 29.5 seconds 42 seconds23 seconds 35 seconds Standard Plan Red truncation allows bus to get started through the intersection sooner
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Objective To evaluate the relationship between Congestion and the distance at which a bus calls for Signal Priority.
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Modeling Single intersection Intersection of NE 33rd Ave and Sandy Blvd Portland,Oregon
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Hardware-in-the-Loop Set up showing desktop computer, CID, and 170 Controller
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Study Design Software - Vissim, Sychro TOD Plans – Not used Approach v/c ratios - 1.1, 0.9, 0.7, 0.5 Volumes - 1640, 1330, 1040, 735 V/hr Buses - Route 12, 15 min headways, staggered starts
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Study Design Data Collection Three Categories – Travel Time, Waiting Time, Delay Travel Times – Fixed 1000 ft section Waiting time Delay – Buses only
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Signal Timing Red Truncation 39.5 seconds 34.5 seconds32 seconds 27.5 seconds 29.5 seconds 42 seconds23 seconds 35 seconds Standard Plan
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Scenarios Bus stop locations – Far and Near Call distance vs v/c Call Distancev/c Ratio 420 feet1.10.90.70.5 350 feet1.10.90.70.5 280 feet1.10.90.70.5
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Results-Avg Travel Times Table 1 Average Travel Times Detector Length v/cDirection280 ft350 ft420 ft 1.1 East66.764.864.1 West75.676.380.9 0.9 East62.562.261.8 West75.470.173.0 0.7 East61.462.159.3 West70.068.069.3 0.5 East62.560.860.2 West64.964.767.3
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Results – Farside
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Results - Nearside
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Results – Delay Farside
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Results – Delay Nearside
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Results - Wait Time Farside
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Results - Wait Time Nearside
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Conclusions/Further Research Near side Far side Call button 2 Hour Cycles
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Acknowledgments TriMet Paul Zebell, Willie Rotich, Bill Kloos - City of Portland Connie Hotard - PTV America Peter Koonce, Selman Altun - Kittelson and Associates Dr. Robert Bertini, Dr. Chris Monsere, Erin Qureshi, River Hwang, Neil Byrne, and Office of Academic Affairs - Portland State University
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Thank You
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